Architecture

The rendering pipeline for XSL-FO-based renderers:

1. AsciiDoc source is converted to DocBook 5 XML by AsciidoctorJ
2. Saxon-HE applies DocBook XSL stylesheets to produce XSL-FO
3. The IKE customization layer adjusts formatting for IKE brand styles
4. Apache FOP or RenderX XEP renders the XSL-FO to PDF

Customization Layer

The IKE FO customization imports the upstream DocBook XSL 1.79.2 stylesheets and overrides specific templates for:

• Page geometry and margins matching IKE print specifications
• Header and footer layout with IKE branding
• Font family assignments using the minimal-fonts Noto subset
• Table and figure formatting
• Code listing presentation

Batik SVG Workarounds

Apache FOP uses Batik for SVG rendering. This module includes post-processing fixes for known Batik limitations:

• Missing width/height on <rect> elements
• orient="auto-start-reverse" on <marker> elements
• alignment-baseline="central" (SVG2, unsupported by Batik)
• fill:rgba() function values converted to hex